Sphygmomanometer.



P. NICHOLSON. SPHYGMOMANOMETER.

APPLICATION FILED NOV. 8, 1913.

Patented Apr. 28, 1914.

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ATTORNEY,

STATESPATENT OFFICE.

PERCIVAL'ICHOLSON, OF ARDMORE, PENNSYLVANIA. i

SPHYGMOMANOMETER.

Specification of Letters Patent.

Patented Apr. 28, 1914.

Application filed November' 8, 1913. Serial N o. 799,849.

f State of Pennsylvania, have invented certain Improvements inSphygmomanometers, of' which the following is a specification.

My invention is a sphygmomanometer provided with a tube, a valvelnechanism connected therewith, and a second tube connected indetachable relation to said first tube through said valve mechanism, bypeculiar supporting means comprising, in its preferred form, a clipfixed to the valve and adapted to be turned therewith.

`The primary object of' my improvements is to provide a simple, compactand efiicient device, movable with the opening and closing of' the valveinto its operative and inoperative positions, for supporting thedetachable tube in its operative position, while permitting` the readyconnection of said tube when the valve is open and disconnection ofsaidtube prior to closing said valve.

It is a further object lto provide an extended supporting device for thedetachable tube and for the folding of said device within ,the limits ofthe case of the apparatus when the latter is not in use.

In ,the accompanying drawings, Figure 1 is a front elevation of asphygmomanometer embodying my improvements in operative relation; Fig.-2 is a broken part sectional side elevation of the same; F ig. 3 is asectional view taken on the line 3-3 of Fig. 2; and Fig. 4 is a brokenelevation representing details of the construction in the inoperativerelation.

The apparatus, as illustrated in the drawings, comprises the`case 1having the hinged lid 2, within which is fixed the cistern 3, the

glass tube 4 connected with the bottom of the` cistern, the valve casing5 having the fenestrated socket 6 for holding the top of the tube, thefenestrated valve 7 adapted to be turned in the casing by the handle 8,the resilient clip 9 fixed by e shank 10 to thel rear end of the rotaryvalve, and the glass ,j

pass through the clip 9,

tube 11 adapted to casing 5 and valve 7, s1n the open position of thelatter, into the to of the tube 4, the latter having the conica seat 4for receivin the reversely tapered end 11 .of the tu e 11. Y i

In the operative relation of` the parts, as illustrated in Fig. 1,pressure vis communi- 'positions of the cistern.

cated to the surface of mercury in the cistern 3 by means of thepneumatic bulb 12 connected with the cistern through the tube 13 andfixture 14 which is fixed to the lid (a like pressure beingcommunicated.from the vfixture through the tube 15 to the cufrn 16), themercury rises in the tubes 4 and 11 with the pressure, and the height ofthe colunm in the tube or tubes is read by the scale comprising thesection 16 held adjacent to the tube 4 and the section 17 connected tothe section 16 by the hinge 18 and held thereby adjacent to the tube 11.

When the apparatus is not in use, the tubes 13 and 15 are detached fromthe fixture 14; the tube 1l is withdrawn from its frictional engagementin the clip 9, valve. 7 and socket 4 and placed in its tubular holder 19fixedv within the lid 2; the scale section 17 is turned down on itshinge 1S against the section lG, and the handle 8 is turned from theposition shown in Fig. 1 to that of 4 so as to effect the closure ofthevalve 7 and permit the closure ot' the lid 2 by bringing both the handle8 and the clip 9 with its shank 10 at right angles to the tube 4 andWithin the limits of the lid.

It will be understood that'as the lid cannot be closed 'until the valveis closed, because of the projection of the handle 8 and clip 9 beyondthe lid in the open position of the valve, mercury cannot escape fromthe tube 4 when the lid is. closed, and in the closed or other positionof the lid mercury is prevented from escaping from the cistern 3 to thefixture 14 by any suitable means, as the capillary tube 20 extendingdownwardly in the cistern from the top thereof and having its reducedend above the mercury in all The supporting shank 10 is adapted to serveas a handle vfor turning the valve and as a means for preventing theclosure of the lid in the open position of the valve.

Having described my invention, I claim: 1. In a sphygmomanometer, atube, a valve casing fixed to `an end ofsaid tube, a valve movable insa-id casing whereby said tube is opened and closed, aseeondtubenconnected with saidtube first named through said valve, and meansfixed to and movable with saidvalve whereby said second tube issupported. 2. In a sphygmomanometer, a tube, mechanism -fixed to the endof saidtube, a valve movable under control of said mechanism.

whereby said tube is opened and closed, a

supporting device comprising a elip fixed iid with its end fixed to saidcasing, a, valve adapted to turn in said casing to open and close saidtube a detachable tube Ldapted to pass through said valvev in the openposition thereof into registration with said tube first named, and adevice fixed to said valve and adapted for supporting said detachabletube, said device extending beyond Loewe@ said lid in the open positionof Said vulve and lying Within the limits of said lid in the closedposition of said valve.

4. 1n a sphygmomanometer, a, tube, a valve mechanism comprising a Valveadapted for opening and closing said tube, a second tube connected withsaid rst tube through said valve, and means for supporting saidvseco'ndtube.

In testimonI whereof I have hereunto set my hand/t is 7th day of Non,1913, in thev presence of the subsoribin Witnesses.

PERCIVAL NI HOLSON.

Witnesses: v

dos. G. DENNY, GUY S. CLAIR.

